package com.example.picturebacked.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.picturebacked.contant.UserContant;
import com.example.picturebacked.exception.BusinessException;
import com.example.picturebacked.exception.ErrorCode;
import com.example.picturebacked.manager.auth.StpKit;
import com.example.picturebacked.model.dto.user.UserQueryRequest;
import com.example.picturebacked.model.entity.User;
import com.example.picturebacked.model.vo.LoginUserVO;
import com.example.picturebacked.model.vo.UserVO;
import com.example.picturebacked.service.UserService;
import com.example.picturebacked.mapper.UserMapper;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.example.picturebacked.contant.UserContant.USER_LOGIN_STATE;

/**
 * @author lbt
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-08-19 15:32:41
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    @Override
    public Long userRegister(String userAccount, String userPassword, String checkPassword) {
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
        }
        // 2. 检查是否重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 3. 密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole("user");
        boolean save = this.save(user);
        if (!save) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败");
        }
        return user.getId();
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 判断参数
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        // 2. 密码进行加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3. 判断用户是否存在
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq("userAccount", userAccount);
        userQueryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(userQueryWrapper);
        // 4. 用户不存在，返回异常信息
        if (user == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
        }
        // 5. 记录登录态
        request.getSession().setAttribute(USER_LOGIN_STATE, user);
        // 记录用户登录态到sa-token，便于空间鉴权时使用，注意保证该用户信息与SpringSession中的信息过期时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(USER_LOGIN_STATE, user);
        return this.loginUserVO(user);
    }

    @Override
    public LoginUserVO loginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        // 用户转换
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    /**
     * 将查询请求转换为QueryWrapper对象
     *
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();
        userQueryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        userQueryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        userQueryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        userQueryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        userQueryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        // 判断是否为升序
        userQueryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return userQueryWrapper;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取当前登录用户
     *
     * @param request 请求数据
     * @return 返回登录的用户
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        Object user = request.getSession().getAttribute(USER_LOGIN_STATE);
        User currentUser = (User) user;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        // 为了防止缓存更新不及时，所以要再次查询数据库
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    @Override
    public boolean removeById(HttpServletRequest request) {
        if (request == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR);
        }
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }


    /**
     * 密码加密
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        String SALT = "lbt";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserContant.ADMIN_ROLE.equals(user.getUserRole());

    }
}




